1/** Used to compose unicode character classes. */
2var rsAstralRange = '\\ud800-\\udfff',
3    rsComboMarksRange = '\\u0300-\\u036f',
4    reComboHalfMarksRange = '\\ufe20-\\ufe2f',
5    rsComboSymbolsRange = '\\u20d0-\\u20ff',
6    rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
7    rsDingbatRange = '\\u2700-\\u27bf',
8    rsLowerRange = 'a-z\\xdf-\\xf6\\xf8-\\xff',
9    rsMathOpRange = '\\xac\\xb1\\xd7\\xf7',
10    rsNonCharRange = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf',
11    rsPunctuationRange = '\\u2000-\\u206f',
12    rsSpaceRange = ' \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000',
13    rsUpperRange = 'A-Z\\xc0-\\xd6\\xd8-\\xde',
14    rsVarRange = '\\ufe0e\\ufe0f',
15    rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange;
16
17/** Used to compose unicode capture groups. */
18var rsApos = "['\u2019]",
19    rsBreak = '[' + rsBreakRange + ']',
20    rsCombo = '[' + rsComboRange + ']',
21    rsDigits = '\\d+',
22    rsDingbat = '[' + rsDingbatRange + ']',
23    rsLower = '[' + rsLowerRange + ']',
24    rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']',
25    rsFitz = '\\ud83c[\\udffb-\\udfff]',
26    rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
27    rsNonAstral = '[^' + rsAstralRange + ']',
28    rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
29    rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
30    rsUpper = '[' + rsUpperRange + ']',
31    rsZWJ = '\\u200d';
32
33/** Used to compose unicode regexes. */
34var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')',
35    rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')',
36    rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
37    rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
38    reOptMod = rsModifier + '?',
39    rsOptVar = '[' + rsVarRange + ']?',
40    rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
41    rsOrdLower = '\\d*(?:1st|2nd|3rd|(?![123])\\dth)(?=\\b|[A-Z_])',
42    rsOrdUpper = '\\d*(?:1ST|2ND|3RD|(?![123])\\dTH)(?=\\b|[a-z_])',
43    rsSeq = rsOptVar + reOptMod + rsOptJoin,
44    rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq;
45
46/** Used to match complex or compound words. */
47var reUnicodeWord = RegExp([
48  rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
49  rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')',
50  rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower,
51  rsUpper + '+' + rsOptContrUpper,
52  rsOrdUpper,
53  rsOrdLower,
54  rsDigits,
55  rsEmoji
56].join('|'), 'g');
57
58/**
59 * Splits a Unicode `string` into an array of its words.
60 *
61 * @private
62 * @param {string} The string to inspect.
63 * @returns {Array} Returns the words of `string`.
64 */
65function unicodeWords(string) {
66  return string.match(reUnicodeWord) || [];
67}
68
69module.exports = unicodeWords;
70